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Low pH (6, 5 and 4) sulfate reduction during the acidification of sucrose under thermophilic (55 °C) conditions by S.I.C. Lopes; I. Sulistyawati; M.I. Capela; P.N.L. Lens is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The effect of a low pH (6, 5 and 4) and different COD/SO 4 2À ratios (9 and 3.5) on thermophilic (55 8C) sulfate reduction and acidification of sucrose was investigated using three upflow anaerobic sludge bed reactors fed with sucrose at an organic loading rate of 3.5 gCOD (l reactor d) À1 . The three reactors showed nearly 100% acidification of sucrose for all pH values and COD/SO 4 2À ratios investigated. Sulfate reduction was complete at pH 6 and a COD/SO 4 2À ratio of 9. At pH 5, sulfate reduction efficiencies were 80-95% for both COD/SO 4 2À ratios (9 and 3.5). At pH 4, sulfate reduction efficiencies further dropped to 55-65% at a COD/SO 4 2À ratio of 9 and 30-40% at a COD/SO 4 2À ratio of 3.5. The pH decrease from 6 to 5 or 4 caused a shift in the acidification products from mainly acetate to butyrate, as well as a higher production of ethanol, especially at pH 4. At pH 4, propionate and methane were not formed and hydrogen concentrations in the biogas reached 50%, equivalent to a hydrogen yield of 1.3 mol H 2 (mol glucose) À1 . This study shows that sulfate reduction is possible in the acidification phase of anaerobic wastewater treatment at pH values as low as 6 till 4 and

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Author

S.I.C. Lopes; I. Sulistyawati; M.I. Capela; P.N.L. Lens

Publisher

Elsevier Science; Elsevier ; Elsevier Applied Science; Elsevier BV (ISSN 1873-3298)

Published

2007

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)